Exhaust silencer



June 11, 1946. P. E ROSALES EXHAUST S ILENCER ezfijaies M E INVENTOR I J W June 1945- P. E. ROSALES 2,402,087

EXHAUST SILENCER Filed Oct. 28, 1943 2 Sheets-Sheet 2 l m M 44 32 WI Z00 74 Z6 .5

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ATTE! RN EYS Patented June 11, 1946 UNITED STATES PATENT OFFICE I EXHAUST SILENCER Pedro Enriquez Rosales, Piedras Negras, Mexico Application October 28, 1943. Serial No. 507,982

4 Claims. 1

Figure 2 is an end' view of the engine with the silencer partlyin section. a

Figure 3 is a sectional view of the silencer.

Figure 4,is a. sectional view through a fan housing, and

Figure 5 is a perspective view of an exhaust port grate.

In the embodiment of the invention selected for illustration, I make use of a relatively large housing It which is provided with lateral proiections or chambers l2 attached to the engine. The chambers are provided with exhaust receiving openings H, the end chambers l2 each including one such opening and the two intermediate chambers each including two such openings. One opening it is provided for each.

cylinder of the engine.

Each chamber I2 is provided with a grate I8 made up of at least four wedge elements [8. These elements have their bases attached to a bar 28 comprising a right angular extension on a bar 22 fixed to one wall of its respective chamber I2. The elements I8 are of the same length and extend the full width of their respective chambers l2, but the elements are equally spaced one from the other and with the upper and lower elements spaced similar distances from the top and bottom walls of the chamber.

The housing [8 includes a conduit 24 for exhaust gases, which conduit is in the nature of an 'elbow having one end bolted at 28 to a fan housing 28 having an inlet opening 38. A fan 82 is mounted in the housing 28 coaxially of the opening 80 and attached to a drive shaft 34.

Figure 1 illustrates the shaft 84 as being provided with a pinion 38 meshing with the starter gear 88 of the engine 40. I prefer to drive the fan 82 at a speed five times greater than the crank shaft speed of the engine. A roller bearing 42 may be supported on the cover M of the fan housing to afford good support for the shaft 34.

A fresh air inlet tube 48 is arranged coaxially of the opening 38 and projects through the bend in the elbow 24 for communication with the atmosphere. I

A neck 48 has communication with the fan housing 28 and with one end of a tubular housing 58. This housing tapers uniformly from its end connected withthe neck 48 throughout its entire length. The small end of the housing 50 is provided with a screen disk 82, and screen 2 4 disks 54 of progressively larger diameters are spaced longitudinally of the housing 50. Conical screens 56 have their base ends respectively connected with the screen disks 54 and with their apexes engaging forwardly positioned disks 54 with the exception of the foremost screen 58, the latter having its apex attached to the apex of a reversely positioned cone screen 55 having its base attached to the screen 52.

The exhaust gases passing through the openings H are divided into a plurality of streams by the wedge elements Hi. The divided gas streams pass into the housing I0, the latter being of relatively large capacity. The gases in the chamber H) are drawn into the fan housing 28 and are driven therefrom through the neck. 48 and into the housing 50. At the same time, pure air is drawn into the fan housing 28 through the medium of the tube 48. The fan is of' greater transmission capacity than the exhausting capacity of the motor. The tube 48 functions as an auxiliary air supplying medium for the fan. Because of the manner in which the exhaust gases are evacuated from the chamber It, all exhaust noises are eliminated.

Without further elaboration, the foregoing will so fully explain my invention, that others may,

by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim: v

1. A silencer for an internal combustion engine, comprising an exhaust receiving housing provided with lateral chambers connected to the engine, a tubular housing, perforated means inside said tubular housing, a conduit between said first mentioned housing and said tubular housing, and a fan housing interposed in said conduit, a fan mounted in said housing for evacuating exhaust gases from the first mentioned housing and blowing the gases through said tubular housing.

2; The invention described in claim 1 wherein means are provided for admitting atmospheric air to said fan.

3. The invention described in claim 1 wherein each of said exhaust receiving chambers of said 

